Studies On Water-saving Irrigation Modes Of Grap In The Western Gobi

The climate is a temperate arid and water resources are relatively poor in Jiayuguan City,in the western Hexi Corridor, Gansu Province, because of lack of specific research on the gravelsoil of Western Gobi Desert with drip irrigation water-saving cultivation techniques. In additionto the vineyards, laying mulch increased costs and making a lot of work more complicated.Production directly exposed drip phenomenon is very common. Therefore, based on experienceplanting grape in the actual production often, and only refer to other parts of drip irrigationmethod, drip irrigation operations, resulting in lack of drip irrigation or drip excessphenomenon occurring. Production had an adverse impact due to be unable to play the savingeffect of drip irrigation technology,. In order to effectively improve the water-saving benefits ofdrip irrigation technology in the production of grapes, make the best of the water resources inthis experiment, limited liability company to Jiayuguan City Hongfeng Industry vineyard trialsites in2010to2011for two consecutive yearsfield experiments were set up with mulching,drip irrigation volume of160m³/acre,200m³/acre,240m³/acre,280m³/acre andnon-coated handle controlled trial of240m³/acre, and the grape growing season in the studyon covered drip irrigation technology in the irrigation system and non-coated drip irrigationtechnology, soil water status, photosynthetic characteristics, grape yield and sugar content. Themain conclusions was drawed as follows:1. Early grapes from infancy to the flowering period at a relatively low level of demand forsoil moisture, the water content of soil in the days decreased by0.27%from flowering in thelate period of berry coloring pre by grape leaf area increased transpiration of strong dehydrationand the Gobi windy dry conditions, grape water demand begins to increase with the prolongeddays and decline to0.90%, and coloring in the early reached1.07%, from berry coloring in thelate maturity, the grapes on the soil moisture decreases gradually, and finally reduced to0.32%.It also shows that the20-60cm soil moisture significantly affect the natural evaporation andgrape transpiration water loss in order to maintain the appropriate moisture content of20-60cmsoil drip irrigation grape production.2. Different amount of drip irrigation, the photosynthetic rate and transpiration rate of thegrapes are demonstrated with increasing the amount of the drip irrigation. These rising values showed some positive correlation in five different amount of drip irrigation processing withmulching240m³/acre of grapes, the transpiration rate of the highest reached to8.2525mmolH2O m^-2 s^-1, but the photosynthetic rate is not the highest, for41.0625μmolCO2m^-2 s^-1.This indicates that the transpiration rate and photosynthetic rate is not necessarily a positivecorrelation within a certain range.3. In the case of coated grape production under different treatment is basically with theincrease of irrigation water, but in the irrigation capacity of200m³/acre and240m³/acreproduction is basically flat, respectively1749.9kg/acre and1716.35kg/acre. When irrigationwater is up to280m³/acre, grape production and a significant increase to2211.85kg/acre.With increasing irrigation volume, the certain conditions increased grape production To meet orexceed the irrigation amount, when the irrigation amount grape production does not appear tosignificantly increased yield and irrigation amount and then increase the grape yieldsignificantly.4. The amount of drip irrigation160m³/acre the sugar content is22%, the irrigationcapacity of200m³/acre, and the sugar content of grapes reached23.31%.when greater than200m³/acre to240m³/acre, the sugar content of the declining trend in23.2%. So the decline isnot obvious, when more than240m³/acre, up to280m³/acre of sugar content will besignificantly lower21.08%. In the same irrigation conditions, not coated with mulching grapesugar than grape sugar content higher than1.87%. So the overall performance of drip volumewas200m³/acre.Grape sugar content was less than or greater than the Drip Irrigation. Thesugar content will continue reducing.The best drip irrigation water requirement was established by the comprehensive analysisof the photosynthetic characteristics, yield, sugar content of more rational and efficient dripirrigation grape irrigation system under the above conditions for the different treatment. Theirrigation capacity per acre was200m³, at different growth stages, There were a total of12times drip in different growth periods. Pre-drip and post-drip was different: the amount ofvolume in the early and late stages was small and the midlle stage was the biggest.